Controlling device.



v1/1H. GAULKB.

GONTROLLING DEVICE.

'APPLICATION FILED AUG. 12, 1912.

1,070,597, 1 Patented Aug.19, 1913.

I Illllllllllu 1' UNITED Sil-AWE a l si.

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WILLIAM H. GAULKE, 0F MILWAUKEE, WISCONSIN, ASSIGNOR TO INDEPENDENT ELECTRIC MANUFACTURING C0., 0F MILWAUKEE, WISCONSIN.

CONTROLLING DEVICE.

Patented aug. 1 9', rara.

Application led August 12, 1912. Serial No. 714,714.

To all whom t may concern.'

Be it known that I, VILLIAM H. GAULKE,

a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and vices and more particularly to alternating current starting devices in the general nature of rheostat starting devices.

My invention is more particularly an improvement over the device disclosed in my Patent No. 1,009,661, issued Nov. 21, 1911. I find that in devices of this general character in which a magnet is used .to hold a switch arm, a specially constructed magnet which may retain its armature in an attracted position under the influence of alternating currents is required and my said patent discloses an electromagnet of this general character. signed by means of its armature to hold in a limiting position the rheostat switch arm.l

This switch arm. is lspring controlled and strong tendency exists to restore this arm to its normal position, which tendency musty be overcome due to the action of the magnet so long as alternating current traverses its winding. The tractive eiiort of this electromagnet, however, is not very large and I vnd that a special construction of mechanism interposed between the magnet armature and the switch arm 1s desirable 1n order lthat the means tending to restore the-switch arm to normal position will be ineffective so long as alternating current is present in the. -magnet winding. To this end my inventlon herein is particularly directed.

v I will explain one embodiment of my invention in connection with the accompanying drawing, ,this embodiment setting forth one of the ways in which 1 have used my invention to accomplish the desired result. In this drawing I represent the front plate of a rheostat starting device with the apparatus normally mounted on the front face of this front plate. In this illustration the front plate 1 is designed to cover a box-like structure mounted to the rear of this plate to which this front plate is secured by means of screws 2, 2. Thisbox-likc structure is This electromagnet is de not shown as it forms no part of the invention, being merely forv the purpose of holding the resistance units which are adapted for connection with contact segments 3,3. A switch arm 4 pivoted at 5 and having a handle 6 is designed to coperate with the segments 3 and also carries a contactele` ment 7 designed to coperate withA contacts 8 and 9. This switch arm carries a lug orpin 10 by means of which it is finally held in its limiting position as will be apparent hereinafter.

An, electromagnet 11 is mounted to the i plate 1 and'is similar in its general characteristics to the electromagnet set forth in my said patent. AThis electromagnet by means of its terminals 12, 12 is designed to control an armature 13 having a core piece 14. As this device is used for alternating currents' the electromagnet 11 must retain its armature 13 in an attracted position under the influence of alternating current.

For this reason the special construction set forth in my said patentl is utilized.

As the effort exerted by the magnet against the armature is rather slight during the reversal of the polarity of the current, I

desire a holding arrangement for the switch arm 4 which.y will not normally tend to restore the armature 13 to its unattracted position with any very great etl'ort. To this end I use a bar 15 pivoted at 16 which has an inclined surface 17. This bar 15 also has a notchy 18. Now when the arm 4 is moved into its limiting position the pin l10 engages the surface 17 temporarily to lift the bar 15 upwardly until the pin 10 engages the notch 18,- in which position the arm 4 is then held provided the armature 13 is attracted as this armature 13 bears by means of a resilient arm 19 against the right hand extremity of the bar 15. Limitl stops 20 and 21 are provided for the bar 15. It will thus be seen that the spring 22 which normally tends to restore the arm 24 against its stop 23 will exert its pull against the bar l5 with no tendency to restore the armature 13 to normal. A slight tendency to restore thisar-l mature 13 to its unattracted position is due to the over-weighted construction of the bar 15, but this tendency is Very slight and not suiiicient to restore this armature when alternating current traverses the winding of the. magnet 11. magnet 11 be broken, however, the armature Should the circuit through the moves into the position shown in the illustration and the over-weighted bar l5 also moves into the position shown in theillustration whereupon the spring 22 can restore ythe arm 4 to normal. l

While I have herein shown and particularly described one form of carrying out my invention, I do not mean to limitpmyself to such specific embodiment, but- `v Having thus described and shown one form of my invention, What I claim asy new and desire to secure by Letters Patent ist 1. In a device of the character described the combination with a Contact arm, means tending to move said arm ina given direction, and means to hold said arm in a given position in opposition to `said first tending to move said arm in a` given direction, vand means to hold said arm in a given position in oppositionto said rst aforesaid means, said last aforesaid means comprising an electromagnet adapted to be energized by alternating currents, an armature therefor, an overweighted arm under the control of said armature, a spring on said armature for engaging said arm, a pin on said contact arm adapted to engage said arm and be held thereby, and a notch in said arm With which said pin cooperates, the engagement between said last aforesaid means and said overweighted arm being 'against a surface substantially lparallel to the direction of motion of said overweighted arm.

3. In a device of the character described, the combination with a contact arm, means tending to move said arm in a, given direction, and meansto hold'said arm in a given position in opposition to said firstaforesaid means, said last aforesaid means comprising an electromagnet adapted to be energized by alternating currents, an armature therefor, a pivotally mounted-arm under the control of said armature, a spring on said armature for engaging said arm, and means on said contact arm adapted to engage'said arm and be held thereby, said means tending to restore ythe contact arm exerting its effort against said pivotal mounting.

4. In a device of the character described the combination With a contact arm, means tending to move said arm in a given direction, and means to hold said arm in a given position in opposition to said first aforesaid means, said last aforesaid means comprising an electromagnet adapted to be energized by alternating currents, an armature therefor, a pivotally mounted arm under the control of said armature, a spring on said armatureV for engaging said arm, a pin on said 'contact arm adapted to engage said arm and be held thereby, and aynotch in said arm with which said pin coperaties, said means tending to restore the contact arm exerting its effort against said pivotal mount-ing.

5. In a device of the character described the 'combination With a contact arm, means tending to move said arm in a given direction, and means to hold said arm in a given y position in opposition to said first aforesaid means, said lastaforesaid means comprising an electromagnet adapted to be energized by alternating currents, an armature therefor, an overWeighted pivotally mounted arm under the control of said armature, a spring on said armature for engaging said arm, and means on said contact arm adapted to engagesaid armand be held thereby, said means tending to restore the contact arm exerting its effort against said pivotal mounting.

6. In a device of the character described the combination with a contact arm, means tending to move said -arm in a given direction, and means to hold said arm in a given position in opposition to saidiirst aforesaid means, said last aforesaid means comprising an electromagnet adapted t0 be energized by alternating currents, an armature therefor, an overweighted pivotally mounted arm under the control of said armature, a spring on said 'armature for engaging said arm, a pin on 'said contact arm adapted to engage said arm and be held thereby, and a notch in said arm with which said pin cooperates, said means tending to restore the contact arm `exerting its eort against said pivotal mounting.

In Witness my'nalne this ywhereof, I hereunto subscribe 12th day of July A.. D., 1912. VILLIAM Il. GAlULKE.

l/Vitnesses:

Gr. WELCH,

F. UMAGIN. 

